WebKit contains a use-after-free error in the 'Document::finishedParsing' function [WebCore/dom/Document.cpp] when handling frames. With a specially crafted web page, a context-dependent attacker can dereference already freed memory and potentially execute arbitrary code.

It has been reported that this issue has been fixed. Upgrade to version 1.6.0, or higher, to address this vulnerability.

Upgrade to Apple iOS 5, or higher, to address this vulnerability.

• CVE ID: 2011-2356 (see also: NVD)
• Secunia Advisory ID: 46339 46377
• Bugtraq ID: 50066
• ISS X-Force ID: 70500
• Related OSVDB ID: 76319 76320 76321 76322 76323 76324 76325 76326 76327 76328 76329 76330 76331 76332 76333 76334 76335 76336 76337 76338 76339 76340 76342 76343 76344 76345 76346 76347 76348 76349 76350 76351 76352 76353 76354
• Mail List Post: http://lists.apple.com/archives/Security-announce/2011//Oct/msg00001.html
  http://lists.apple.com/archives/Security-announce/2011//Oct/msg00004.html
  http://seclists.org/bugtraq/2011/Oct/73
  http://seclists.org/bugtraq/2011/Oct/78
• Vendor Specific News/Changelog Entry: http://support.apple.com/kb/HT4981
  http://support.apple.com/kb/HT5000
  https://bugs.webkit.org/show_bug.cgi?id=62812 [ Auth Req'd ]
  https://code.google.com/p/chromium/issues/detail?id=86367
• Vendor Specific Advisory URL: http://support.apple.com/kb/HT4999
• Vendor Specific Solution URL: http://trac.webkit.org/changeset/89067
• News Article: http://www.zdnet.com/blog/security/apple-slaps-another-security-band-aid-on-itunes/9598

• Adam Barth - Google Chrome Security Team
• Abhishek Arya (Inferno) - Google Chrome Security Team